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Author Topic: Profezzorn's second build (OWK + TeensySaber V2)  (Read 14821 times)

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Offline profezzorn

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #30 on: September 22, 2016, 08:08:41 PM »
I wonder how wiring will work on the OWK?

On a graflex 2.0, it's possible to run wires from the buttons to the bottom of the saber by doing some cutting in the "grenade" section. (As shown in the "let's build a graflex 2.0" youtube series.)  However, the OWK renders seems to indicate that the section right below the blade holder is a single layer of metal that screws in to the blade holder. Hopefully we'll get pictures of the final product soon...
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Offline profezzorn

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #31 on: September 30, 2016, 12:11:44 AM »
Got my prototype boards today:



Hopefully I'll have time to bake some boards this weekend. :)
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Offline profezzorn

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #32 on: October 01, 2016, 08:36:57 PM »
Got the board baked, looks glorious, but of course it probably doesn't work... I'm worried about all the QFN components since I can't see the leads.



Testing will have to wait until tomorrow though.
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Offline profezzorn

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #33 on: October 03, 2016, 11:49:28 PM »
Sometimes I hate it when I'm right... It doesn't work.
Turns out I have a mistake in the schematics for the voltage regulator, so no power regulation for me....
Anyways, I'm taking the opportunity to improve some things, most importantly I'm adding spaces and pads for three more LEDs, which means that with a tiny bit of hand-soldering, the 2.1 board can be used with six-segment LED strings. The pads for three extra FETs are SOT-23 to make them easy to hand-solder.  Now I just need to order some new boards. Good thing they are cheap...
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Offline bobi-one

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #34 on: October 04, 2016, 01:47:08 AM »
Quote from: profezzorn on October 03, 2016, 11:49:28 PM
Sometimes I hate it when I'm right... It doesn't work.
Turns out I have a mistake in the schematics for the voltage regulator, so no power regulation for me....
Anyways, I'm taking the opportunity to improve some things, most importantly I'm adding spaces and pads for three more LEDs, which means that with a tiny bit of hand-soldering, the 2.1 board can be used with six-segment LED strings. The pads for three extra FETs are SOT-23 to make them easy to hand-solder.  Now I just need to order some new boards. Good thing they are cheap...

xxx, osh park to bulgaria is taking like 3 weeks to deliver :D.
What is the issue with the power supply? isn't it  something that you can blue wire it?
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Offline profezzorn

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #35 on: October 04, 2016, 09:21:28 AM »
I don't think I could fix it with hookup wire actually. (I'd need to hook up some wire directly to a QFN pad....) However, even if I could, I probably wouldn't bother. I'm just going to back-feed it with 5 volts for now. Since the board is essentially made up of 5 separate circuits (booster, amp, sd, motion, FETs), I'm going to spend a day or two testing the other four circuits to see if there are more mistakes that need to be fixed before I order another board. For me, it takes about two weeks before I get stuff back from oshpark, which isn't terrible, but it's still the slowest part of the project. Luckily, I'm not in a hurry. :)

Btw, if anybody know of a breadboard-friendly and non-permanent way to hook up test leads to headers, please let me know...
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Offline profezzorn

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #36 on: October 05, 2016, 10:03:48 PM »
Ran out of pin headers, so I haven't been able to breadboard and test as much as I like.
However, I did manage to test Boba, Django and Cassus (the FETs), which work perfectly.



It occurs to me that I'm going to need a guinea pig beta tester or two, especially since V2.1 will support 6-segment blades, something that I'm not interested in making myself. Any beta testers would get a free board, in return for a lot of pictures, feedback, etc. If you're interested, please send me a PM, don't forget to include what you intend to do and what you can provide in return.
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Offline bobi-one

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #37 on: October 06, 2016, 07:51:50 AM »
Hmm you can designate one testing teensy board, and solder on the top side some pogo pins, so you can more easily test the shields.
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Offline profezzorn

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #38 on: October 06, 2016, 11:38:30 AM »
The problem with pogo pins is they need pressure to stay connected. Also, you really need at least two circuit boards to hold pogo pins securely. Basically, it seems like pogo pins require more setup, but once that setup is done it lets you test lots of boards easily.  Right now I'm looking for something that require less setup, and lets me test one board easily.
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Offline profezzorn

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #39 on: October 08, 2016, 09:23:17 PM »
Wow, I really suck at making circuits.
So far, I've found bugs in 3 of the five circuits, and the only thing that seems to work is the FETs.
Now if I could just figure out what's wrong with the amplifier, I'd feel a bit better about prototype #2.
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Offline bobi-one

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #40 on: October 10, 2016, 03:24:36 AM »
Quote from: profezzorn on October 08, 2016, 09:23:17 PM
Wow, I really suck at making circuits.
So far, I've found bugs in 3 of the five circuits, and the only thing that seems to work is the FETs.
Now if I could just figure out what's wrong with the amplifier, I'd feel a bit better about prototype #2.
Wanna share your schematic? I will try and make a review
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Offline profezzorn

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #41 on: October 10, 2016, 09:37:29 PM »
Latest schematic:

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Offline bobi-one

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #42 on: October 11, 2016, 02:03:54 AM »
Hmm from my first glimpse, Haven't you reversed MISO and MOSI pins?
Master is the teensy in that situation
Master out slave in
Master in slave out
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Offline profezzorn

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #43 on: October 11, 2016, 10:20:42 AM »
I think the labels are wrong, but the connections are right.
My previous prototype had the connections wrong, and I probably switch the labels in the wrong way when I fixed it.
I'll update the labels.

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Offline profezzorn

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Re: Profezzorn's second build (OWK + TeensySaber V2)
« Reply #44 on: October 24, 2016, 10:46:25 PM »
Got second prototyp boards



Not sure when I'll have time to put them together though, with halloween and everything...
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